Datasheet Analog Devices AD8315 — Datenblatt

50 dB GSM PA Controller
AD8315 Data Sheet Its high sensitivity allows control at low signal levels, thus
reducing the amount of power that must be coupled to
the detector. FEATURES
Complete RF detector/controller function
>50 dB range at 0.9 GHz (−49 dBm to +2 dBm, re 50 Ω)
Accurate scaling from 0.1 GHz to 2.5 GHz
Temperature-stable linear-in-dB response
Log slope of 23 mV/dB, intercept at −60 dBm at 0.9 GHz
True integration function in control loop
Low power: 20 mW at 2.7 V, 38 mW at 5 V
Power-down to 10.8 μW For convenience, the signal is internally ac-coupled. This
high-pass coupling, with a corner at approximately 0.016 GHz,
determines the lowest operating frequency. Therefore, the
source can be dc grounded.
The AD8315 provides a voltage output, VAPC, that has the
voltage range and current drive to directly connect to most
handset power amplifiers’ gain control pin. VAPC can swing
from 250 mV above ground to within 200 mV below the supply
voltage. Load currents of up to 6 mA can be supported. APPLICATIONS
Single, dual, and triple band mobile handset (GSM, DCS, EDGE)
Transmitter power control The setpoint control input is applied to the VSET pin and has
an operating range of 0.25 V to 1.4 V. The associated circuit …

50 dB GSM PA Controller
AD8315 Data Sheet Its high sensitivity allows control at low signal levels, thus
reducing the amount of power that must be coupled to
the detector. FEATURES
Complete RF detector/controller function
>50 dB range at 0.9 GHz (−49 dBm to +2 dBm, re 50 Ω)
Accurate scaling from 0.1 GHz to 2.5 GHz
Temperature-stable linear-in-dB response
Log slope of 23 mV/dB, intercept at −60 dBm at 0.9 GHz
True integration function in control loop
Low power: 20 mW at 2.7 V, 38 mW at 5 V
Power-down to 10.8 μW For convenience, the signal is internally ac-coupled. This
high-pass coupling, with a corner at approximately 0.016 GHz,
determines the lowest operating frequency. Therefore, the
source can be dc grounded.
The AD8315 provides a voltage output, VAPC, that has the
voltage range and current drive to directly connect to most
handset power amplifiers’ gain control pin. VAPC can swing
from 250 mV above ground to within 200 mV below the supply
voltage. Load currents of up to 6 mA can be supported. APPLICATIONS
Single, dual, and triple band mobile handset (GSM, DCS, EDGE)
Transmitter power control The setpoint control input is applied to the VSET pin and has
an operating range of 0.25 V to 1.4 V. The associated circuit …